Massive Audio SUMMO 84

8″ subwoofer · dual 4 Ω · 300 W RMS

Fs 37.9 HzQts 0.44Vas 0.53 ft³Xmax 0.39″

Recommended box

For a sedan, one sub, 300 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.

Sealed

Net volume0.32 ft³ (9 L)
Qtc0.72
Fc62 Hz
F3 (−3 dB, no cabin gain)64 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 9 1/4″
Open sealed box in designer

Ported

Net volume0.74 ft³ (21 L)
Tuning (Fb)36 Hz
Portround port Ø2 1/2″, 12″ long
Port velocity at 300 W162 ft/s
F3 (−3 dB, no cabin gain)34 Hz
Example box (outside)18 1/8″ × 15 3/4″ × 7 1/2″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs37.9 Hz
Qts0.44
Qes0.49
Qms4.22
Vas0.53 ft³
Re (one coil)3.4 Ω
Sd33.3 in²
Xmax0.39″
Vd13.1 in³ calc.
Mms77 g calc.
BL11.2 T·m calc.
EBP77 — sealed or ported calc.
Sensitivity, 1 W / 1 m84.2 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power300 W

Mounting dimensions

Ø8 9/16″cutout Ø7 1/4″mounting depth 5 1/16″magnet Ø≈ 4 11/16″
Cutout diameter7 1/4″
Mounting depth5 1/16″
Overall diameter8 9/16″

“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.

Data sources

Other Massive Audio 8″ models